/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.engine.memtable;

import org.apache.iotdb.commons.path.AlignedPath;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.wal.buffer.IWALByteBufferView;
import org.apache.iotdb.tsfile.utils.BitMap;
import org.apache.iotdb.tsfile.utils.Pair;
import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.*;

import static org.apache.iotdb.commons.conf.IoTDBConstant.MULTI_LEVEL_PATH_WILDCARD;
import static org.apache.iotdb.commons.conf.IoTDBConstant.ONE_LEVEL_PATH_WILDCARD;

public class AlignedWritableMemChunkGroup implements IWritableMemChunkGroup {

    private AlignedWritableMemChunk memChunk;

    public AlignedWritableMemChunkGroup(List<IMeasurementSchema> schemaList) {
        memChunk = new AlignedWritableMemChunk(schemaList);
    }

    private AlignedWritableMemChunkGroup() {
    }

    @Override
    public boolean writeValuesWithFlushCheck(
            long[] times,
            Object[] columns,
            BitMap[] bitMaps,
            List<IMeasurementSchema> schemaList,
            int start,
            int end) {
        return memChunk.writeAlignedValuesWithFlushCheck(
                times, columns, bitMaps, schemaList, start, end);
    }

    @Override
    public void release() {
        memChunk.release();
    }

    @Override
    public long count() {
        return memChunk.count();
    }

    /**
     * Check whether this MemChunkGroup contains a measurement. If a VECTOR_PLACEHOLDER passed from
     * outer, always return true because AlignedMemChunkGroup existing.
     */
    @Override
    public boolean contains(String measurement) {
        // used for calculate memtable size
        if (AlignedPath.VECTOR_PLACEHOLDER.equals(measurement)) {
            return true;
        }
        return memChunk.containsMeasurement(measurement);
    }

    @Override
    public boolean writeWithFlushCheck(
            long insertTime, Object[] objectValue, List<IMeasurementSchema> schemaList) {
        return memChunk.writeAlignedValueWithFlushCheck(insertTime, objectValue, schemaList);
    }

    @Override
    public Map<String, IWritableMemChunk> getMemChunkMap() {
        if (memChunk.count() == 0) {
            return Collections.emptyMap();
        }
        return Collections.singletonMap("", memChunk);
    }

    @Override
    public int delete(
            PartialPath originalPath, PartialPath devicePath, long startTimestamp, long endTimestamp) {
        int deletedPointsNumber = 0;
        Set<String> measurements = memChunk.getAllMeasurements();
        List<String> columnsToBeRemoved = new ArrayList<>();
        String targetMeasurement = originalPath.getMeasurement();
        if (targetMeasurement.equals(ONE_LEVEL_PATH_WILDCARD)
                || targetMeasurement.equals(MULTI_LEVEL_PATH_WILDCARD)) {
            for (String measurement : measurements) {
                Pair<Integer, Boolean> deleteInfo =
                        memChunk.deleteDataFromAColumn(startTimestamp, endTimestamp, measurement);
                deletedPointsNumber += deleteInfo.left;
                if (Boolean.TRUE.equals(deleteInfo.right)) {
                    columnsToBeRemoved.add(measurement);
                }
            }
        } else {
            if (measurements.contains(targetMeasurement)) {
                Pair<Integer, Boolean> deleteInfo =
                        memChunk.deleteDataFromAColumn(startTimestamp, endTimestamp, targetMeasurement);
                deletedPointsNumber += deleteInfo.left;
                if (Boolean.TRUE.equals(deleteInfo.right)) {
                    columnsToBeRemoved.add(targetMeasurement);
                }
            }
        }

        for (String columnToBeRemoved : columnsToBeRemoved) {
            memChunk.removeColumn(columnToBeRemoved);
        }
        return deletedPointsNumber;
    }

    @Override
    public long getCurrentTVListSize(String measurement) {
        return memChunk.getTVList().rowCount();
    }

    @Override
    public long getMaxTime() {
        return memChunk.getMaxTime();
    }

    public AlignedWritableMemChunk getAlignedMemChunk() {
        return memChunk;
    }

    @Override
    public int serializedSize() {
        return memChunk.serializedSize();
    }

    @Override
    public void serializeToWAL(IWALByteBufferView buffer) {
        memChunk.serializeToWAL(buffer);
    }

    public static AlignedWritableMemChunkGroup deserialize(DataInputStream stream)
            throws IOException {
        AlignedWritableMemChunkGroup memChunkGroup = new AlignedWritableMemChunkGroup();
        memChunkGroup.memChunk = AlignedWritableMemChunk.deserialize(stream);
        return memChunkGroup;
    }
}
